| Date | Tue, 23 Jul 2013 19:31:49 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH 14/16] usb: musb: dsps: add MUSB_DEVCTL_SESSION back after removal |
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On 07/23/2013 07:28 PM, Bin Liu wrote: > Hi,
Hi,
> > On Mon, Jul 22, 2013 at 1:10 PM, Sebastian Andrzej Siewior > <bigeasy@linutronix.de <mailto:bigeasy@linutronix.de>> wrote: > > This patch adds the MUSB_DEVCTL_SESSION back after it has been removed. > If it is missing then the host session is not recognized. This bit is > added initially added in musb_start() and removed after the first device > disconnect. > > AFAIK, after the device is disconnected, the OTG state machine will go > back to B_IDLE/A_IDLE state. SESSION is not needed in this case.
Okay.
> In OTG mode, when no device is plugged, the ID pin is floating, you can > never hold the host session in this case, even set the SESSION bit. The > SESSION bit will be cleared by the controller after 100ms.
In my testing the bit remains set. How is the bit supposed to come back after I connect a host device?
> Regards, > -Bin. >
Sebastian
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